Friction-clutch.



PATENTED MAR. 17, 1908.

T. C. DEXTER.

FRICTION CLUTCH.

APPLICATION FILED MAR. 20. 1907.

INVENTOR 13 (a. 119124 21X WITNESSES.- 444 0 mf/hn BY I ATTORNEYJ.

TALBOT C. DEXTER, OF PEARL RIVER, NEW YORK.

FRICTION-GLUTCH.

No. 882,299. Specification of Letters Patent. Patented March 17, 1908.

Application filed March 20, 190']. Serial Nnniifiiyili).

To ail whom it may concern: lingers or other equivalent, bridging said Be it known that l, TALBOT C. Dicx'i'irn, a opening. citizen of the United States, residing at Eearl In tile riccornprmying (ii-owing Figure l is a, River, in the county of Rooklsnd and State vertical transverse sectional elevation oi a go of New York, have invented oertiiiniiow and friction clutch such as described in my Patuseiul Improvements in i riction-Clutohes ent No. 815,909, with my present improvefor Paper-Cutting Machines, ii iiiGll the ment applied. Fig. 2 is a detail section on a following is a specification. larger scale, in the same plane as Fig. 1 show- My invention relates to iriction clutches of ing' the joint in the clamping bond and the 5 the general character described in Letters adjacent parts of the leather strap and the Potent No. 815,909, granted to me the th interposed. steel blade. Fig. 3 is 21. detail in of March, 1906, in which a reciprocating side View of part of the some. Fig. 4- is 8, power-member ini arts movemei t to D similar on a smaller scale, of a. slight clamping member, t rough the medium 01 a mogliii l5 friction clutch, with :1 force iimiteil by the L the some reference numcrais which. frictional resistance between the niembors of rlesigi we oorresponilmg ports in. my pre'wthe sail friction clutch. 011s patent No. M5909, indicates the An element of the friction. olutoli described outer l of the clutch which receives re- 1y aforesaid patent is a straw or bend of oipr Ming rotary moi'el'nont iroin a crank 75 .llfiI or like yielding zaiii'teriiil iii-1g oil-Ll Pitllb. not here siiown, (i-J5$S1li)0(l in 1 ring wi'ioel of the cluti t 0. 81551509, and ii) indie-stats tie JG iTiCtlOii surface be =1 (so b' i'riotion. iron; the slut clamping bend on which it o i al on the sill--. infirootioei: i have motion is lino fes"" le to attach the y 1 to oitiieroi the 12.1.. Unites ii; split clumpingbond. of it is i11i;0130:i63@"i rum l5, im'mevl with ii*"*'5 or 2 .12;? possiliile ineoris ends om-imying -:i I'mn the leather r l? ill 11w. :li ni iii pm? m -swiilnotresist ai'imlly liy rows 15?,

W11; 1 the parts are suojo W moiio to retain the le itii tion and smooth form. being free from attachment to p in either dir ction on the faces i3 tween which. is lIE-i81"" $l-.. seqiiemiy one or the other of ii tlie {7211315 teopeil in tignirn ii cliii.

bu ill 2i? and LL I 1, screw iwen the soil: o;

the banal :ritoi' the latte or: ieri over the joint betu n has been clamping bond. and ioterfer therewith, ciezitly tig glitcucil on the "lieci 3 i, .5 40 suiting alsoinjurytothe.lentherstrepitsi, nli.il,l:fioi the scram; 1S :1 i o My present iinpro'veiiioot relates to moons i'oriaier parent. by Whiolio friction strap or bond oiiootheror 313 indicates the strap oi" iontimr or other the like io'ei'poserl between the concentric suitable frictional material iota/posed liemeiriliers of on. adjustable i'irictio" ilzzlclmmy tween the encircling clamping: Mimi a0 and we be prevented from interfering .1 the joint tii. ooriohery oi the clutch-whee i "iiisii: between the ends of the edjustebj... clamping leiri Lei strap 30 separated at ends to member, While to move around between suilirient extent to permit it to follow the the metal surfaces. To this i rionge clumping n'iovenieot of the steel bond 20 and memo to overlap the joint or ope lg he maintain a smooth and even form on iii)? peso tween the ends of the srljustoble P m or riphery of the Wheel 10.

mambo so as to prevent contact owls The purpose of the invention being to o roi the leather strap or ban-ti with She joint mi'i; slip between the oiuton memit-ers the clampin member, Said overlapping 111- after the proper pressure has been :rppi-uzu means may e a single thin Node of steel to piie of paper sheets or otlm... article of 1m bridging the openirig between ends of the m: ermio or variable liei litthe in sezi clamping member, or series of tongues or friction l trap 30 silo on one or both of the members 20 and 10. found best to attach it to neither of these members but leave it free and unconstrained in order that it may maintain a smooth and even condition around the wheel. It is, therefore, liable to creep around the wheel in the oscillating movement of the drum and the space between the ends of the strap will not always correspond in position with that between the ends of the band 20. In order to. prevent the ends of the strap 30 being caught in the joint or opening between the ends of the band, i interpose a thin and elastic blade of steel llbetween the clamping band 20 and the friction strap 30 and bridging or covering the spaceibetween the ends 21.of the band and fixed to the inside of the band by screws orrivets 42 on one side only of ,the. space between theends thereofso as to keepit. in place while permitting it to slip freely; beneath one end of the band to accommodate the clamping movement. The inner surface of the band 20 upon both sides of the opening between its ends is. recessed as shown at 20 to receive the blade 41, the depth of the recess being exactly the thicknets of the blade 41, and the blade being conformed to the curvature of theinner surface of the band 20. The edge 20 of recess 20 adjacent to the free end of band 41 is chamfered off and extended at an acute angle across the inner face of band 20, as shown; and the adjacent free end ll of blade 41 is also chamfered or beveled off and extended at an angle parallel with the edge 20* of re cess 20 The ends of the friction strap 30 are cut at right angles to its length so as to be presented at angles to the. chamfered surface 20 of recess 20* and chamfered edge 41 of blade 41. The ends of strap 30 are also beveled or chamfered inwardly, as shown at 30 (that is oppositely to. the chainfers 20 and 41 to furtheninsure against catching or interference betweenthese parts in their relative circular movement.

in place of using the single bridging plate or blade ll of thin steel, as shown in Figs. 1, 2 and 3 of the drawings, 1 may, employ the means illustrated in lii 4 for bridging the space between the enrls of the adjustable clamping member. in this modified form of my'invention, I provide two series of overlapping tongues or fingers 50 and 51, project ing res ectively from the adjacent ends of the split band 20,- and separated from each other by the longitudinal spaces 52 and their free ends separated from the adjacent ends of the band by spaces 53. It will be understood that these. parallel bridging fingers are conformed to the inner curvatureof the split band so as to present smooth continuations of the friction surface of the said band. The freeends of tongues or fingers 50, 51, may be beveled off slightly as shown to further avoid interference with the ends of the friction In practice it is strap 30. It will, of course, be understood that the friction strap 30 is employed in practically the same manner in this modified form, as above described with reference to Figs. 1, 2 and 3; the ends of strap 30 being presented at slight angles to the ends of tongues or fingers 50, 51, to further avoid interference. The tongues or fingers 50, 51 are graduated in length from side to side of band 20 to properly correspond with the wedge shaped space separating the ends of the band. This modified. form of the device shown in Fig. 4 is a simple construction to manufacture, since the band 20 can be cast with the wedge shaped recess separating its outturned ends 21, and the longitudinal spaces 52 separating the tongue portions 50, 51-, and the tongues afterwards completed for. separating the ends of the band by drilling out suitable o enings.

l would have it understood that do not limit myself to the specific structure of my irn roved clutch but Wish to claim broadly in a c utch of the general type referred to, any and all means for bridging over or overlap ping the space separating the ends of the adjustable clamping member so as to avoid the interference with the ends of the strap or band of friction material. l consider it immaterial to the scope of my invention Whether the adjustable clamping member is the inner or outer member of-the frictional clutch.

lit is thought the operationof the clutch will be clear withoutfurther explanation.

Having thus described my invention, what l claim as new and desire to secure by' Letters Patent is:

1. in a friction clutch, the combination. of cooperating clutch members, one of which consists of a band or rim with separatedends, a strap orband of friction-material interposed between said clutch members, and means in .terposed between the strap of friction material and the adjacent ends of the surround ing split band or .rim, overlapping said adjacent ends and covering the space between them.

2. in a friction clutch, the combination of the cooperating clutch members, one of which comprises a split band or rim with sep arated'ends, a strap or band of friction material interposed concentrically between said clutch members and having its. endsseparated, and. meansoverlapping the adjacent ends of the split band or rim, and bridging or covering the space between said ends.

3. in a friction clutch, the combination of a clutch Wheel, a cooperating concentrically arranged band or rim with separated ends, a strap or band of friction material interposed between the clutch wheel and-the surrounding band or rinmand. a blade or finger overlapping the adjacent separated endsof theband or rim, and bridging the s ace'between them for the purpose set fort 4. line friction clutch, the combination of a clutch wheel, a clamping band with separated ends encircling the wheel, a strap or band of compressible friction material interposed between the clutch wheel and clamping band, and a blade or finger overlapping and bridging or covering the space .between the adjacent ends of the clamping band for the purpose set forth.

5. In a friction clutch, the combination of a clutch wheel, a split clamping band concentrio with the wheel, a strap of friction material interposed between the wheel and the split band, means engaging the ends of the split band for securing the band in frictional engagement with the nterposed strap, and a blade or finger secured to one end of the s )lit band and projecting toward the other end of the split band, for the purpose set forth.

6. In a rotary friction clutch, the combination of a clutch wheel, a split band encircling the wheel, a strap of friction material interposed between the wheel and the encircling band, adjustable means for clamping the band on the friction strap and wheel with variable friction, and a blade or finger of elastic material covering the space between the adjacent ends of the split band, and attached beneath one of said ends and sliding beneath the other.

7. In a friction clutch, the combination of a clutch wheel, a concentric split band, a strap of friction material interposed between the clutch wheel and the split band, and a blade or finger secured to the working face of one end of the split band and projecting over the space separating said ends and overlapping the other end of the split band, the free end of said blade being chamfered or beveled as set forth.

8. In a friction clutch, the combination of a clutch wheel, a concentric split band having its working face recessed adacent to its separated ends, a blade or finger secured at one end in said recess and having its free end cut at an oblique angle, and a strap of friction material interposed between the friction wheel and split band and having its ends presented at an angle to the free end of the blade.

t). In a friction clutch, the combination of a friction wheel, a concentric split band having its working face recessed adjacent to its separated ends, the wall at one end of said recess extending at an oblique angle and beveled as shown, a blade or finger secured at one end in said recess and having an angular free end which overlaps the opposite end of the split band and projects adjacent to the said beveled edge of the recess, and a strap of friction material interposed between the friction wheel and the split band, and having its ends'presented at angles to the beveled 1 end wall of the recess and the angular end of the blade.

10. In a friction clutch, the combination of a friction wheel, a concentric split band, a blade or lin er secured to one end of the band and ovcr lapping the space between the ends of the band, said blade having a beveled free end, and a strip of friction material interposed between the friction wheel and the split band, and havin its ends beveled oppositely to the bevel of the blade.

11. In a friction clutch, the combination of an inner clutch wheel, a drum inclosing said wheel, a divided band encircling the wheel, incloscd in the drum and having outturned ends, means for forcing the outturned ends together to clamp the encircling hand on the clutch-wheel, a strap of soft friction material interposed between the encircling band and the clutch-wheel and a thin blade of elastic material bridging the space between the ends of theband to exclude the friction strap, substantially as described.

TALBOT C. DEXTER Witnesses A. C. I'IAMMOND, G. A. H. Lnrron. 

